I use it a lot. Good for a pre wash, cleaning around badges/grills, wheel wells, tires, engines, door jambs and the list goes on. A very good product. And I always use it straight it comes paint safe right out of the bottle which is a plus IMO.
I dont think I've heard of people using it diluted, mostly everyone just uses it straight out of the bottle
Brian, I dilute at 3:1 and 2:1. Light clean-ups 3:1 works perfect. 2:1 will clean most wheels with the say results as straight 1:1 ! No sense in wasting product.